package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //对前端传来的明文密码进行MD5加密
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    //新增员工
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        //对象属性拷贝，因为在Mapper时用employee来操作比较好，往数据库添加的信息较齐全
        BeanUtils.copyProperties(employeeDTO,employee);

        //设置账号的状态，默认正常状态，1表示正常，0表示锁定
        employee.setStatus(StatusConstant.ENABLE);//不直接写数字1，用一个常量类来定义了

        //设置密码，默认密码123456，存在了一个常量类中，在存到数据库时要先MD5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置当前记录的创建时间和修改时间
        //employee.setCreateTime(LocalDateTime.now());
        //employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录创建人和修改人ID
        //employee.setCreateUser(BaseContext.getCurrentId());
        //employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.insert(employee);
    }

    //分页查询
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //select * from employee limit 0,10
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);
        long total = page.getTotal();
        List<Employee> records = page.getResult();
        return new PageResult(total,records);
    }

    /*
    启用或禁用员工
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //update employee set status = ? where id = ?
        //因为在实体类那里加了一个注解@Builder，所以可以这样来创建一个实体类，比Set方法更快
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.update(employee);
    }

    //根据ID查询员工
    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        //因为不想让前端看到返回来的密码，可以把密码设置成*号，但是数据库里的数据是没有改变的
        employee.setPassword("******");
        return employee;
    }

    //修改员工信息
    @Override
    public void update(EmployeeDTO employeeDTO) {
        //和上面新增员工类似，在Mapper需要的是一个employee，所以得对象拷贝一下
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);

        //补足更新时间和操作人ID,有了切面类，不用自己加了
        //employee.setUpdateTime(LocalDateTime.now());
        //employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

}
